Mystery balls close nine northern Sydney beaches months after fatbergs washed ashore

A scattering of the unidentified ball-shaped debris found washed ashore at Manly Beach and eight other beaches in Sydney's north. Photograph: Northern Beaches Council

Nine of Sydney’s northern beaches have been closed after ball-shaped debris washed ashore.

The Northern Beaches council on Tuesday advised beachgoers to avoid Manly, Dee Why, Long Reef, Queenscliff, Freshwater, North and South Curl Curl, North Steyne and North Narrabeen beaches until further notice.